Steam-boiler



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Tv. L. MGGR'EG-OR- STEAM BOILBR.

' Patented Mar. 1 7, 1896.

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No. 556,473. A Patented Mar. 17, 1896.

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THOMAS L. MCGREGOR, OF MILVAUKEE, lVISCONSIN.

STEAM-BOI'LER.

SPECIFICATION forming part of Letters Patent No. 556,473, dated March 17, 1896.

Application led July 10, 1895. Serial No. 555,476. (No model.)

To all whom, t may concern.:

Be it known that I, THOMAS L. MCGREGOR, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of W'isconsimhave invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to steam-boilers of the kind usually known as water-tube boilers; and it consists in certain peculiarities of construction and combination of parts, as will be fully set forth hereinafter and subsequently claimed.

In the drawings, Figure l is a representation of my device partly in side elevation and partly in section. Figs. 2 and 3 are sectional views on the lines 2 2 and 3 3, respectively, of Fig. 1.

Referring to the drawings, A represents the front wall, and B the rear wall, of suitable masonry, such as brick, which serves to inclose my boiler.

C is the bridge-wall, and D the grate of the lire-bed.

E represents a partition-wall of brick supported on a metallic plate e that extends from side to side of the structure.

F is the top wall, and f the smoke-fine or chimney. The rear wall, B, has a door b for convenient access to the rear end of the boiler, and the front wall, A, a like door a for access to the front end of the boiler, and below this door are shown other doors, c and d, for putting in the fuel and for taking out the ashes, respectively. Y

Referring now particularly to the boiler, G represents the front water and steam chamber of semicircular shape in cross-section, as shown in Fig. 2.

H is the rear waterchamber, of similar shape in its main part, extending down to the lower part of the structure, while the chamber G extends from a point above the lire-bed to the top of the structure. Both of these chambers are obliquely arranged and connected by tubes g g g obliquely arranged at the same angle. The water-chamber H has a vertical upward-extending pipe h of reduced diameter, which forms practically part of said rear water-chamber, and which communicates at its top with the rear end of the horizontallydisposed steam-drum I, which latter, at its front end, communicates with the rear face of the upper part of the water-chamber G. The said chamber G has a manhole i with suitable plate and closing device j in line with door a, and the chamber H has a like manhole lo with like plate and closing device m in line with door b. A blow-oft pipe J extends from the bottom of the chamber G out through the rear wall, B, and L represents the feedwater inlet-pipe extending through said rear wall and into the part h of the rear waterchamber, H, preferably just above the top of the main part of said water-chamber.

M is the steam-outlet pipe, and N the safetyl valve pipe, both leading upward from the steam-drum I.

The operation of my device will be readily understood from the foregoing description of its construction. The feed-water is admitted through the pipe Linto the coolest part of the boiler, which is a great advantage, as thereby the impurities contained in the water will drop down to the bottom of the chamber H, from whence they can be blown out through the pipe J without ever getting into the tubes g g, whereas when the feed-water is introduced at the front of the boiler over the re bed the impurities therein contained become coated by the heat upon the surfaces of the water-chamber and tubes of the boiler.

As my feed-water inlet-pipe merely extends through the rear wall of the part h of the rear water-chamber, as shown in Fig. l, instead of continuing in loops, bends, or coils within said water-chamber, there is no opportunity for said pipe to become clogged up with any impurities; but everything therein contained will at once drop out and fall down to the bottom of said water-chamber, as stated.

Another advantage of my device lies in the semicircular form shown and described of my water-chambers, as thereby they may be made of suflicient capacity without unduly extend ing them vertically. Again, I iind it of advantage to connect the steam-drum as shown, instead of leading it from the top of the front water-chamber, as vertical space is saved and the device rendered consequently more compact, while at the same time my said steamdrum serves to brace and strengthen the front water-chamber.

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IIaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a tubularboiler, the Combination with a iire-bed, of an obliquelyarranged front water and steam chamber supported above said bed, an obliquely-arranged rear water- Chamber extending below the plane of the front chamber, obliquely arranged watertubes Connecting the two Chambers, ahorizontally-disposed steam-drum connected to the rear upper side of the front chamber and with the steam-space thereof, and connecting by a vertical pipe with the rear Chamber, and a feed-water-inlet pipe arranged to communi- Cate with the rear water-ehan1ber at the rear thereof witho ut extending within said charnber, whereby the feed-water will always be received at the coolest part of the boiler and thesaid inlet-pipe be kept free from seale and other impurities, substantially as set forth.

In testimony that I elaiin the foregoing I 35 have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Iisooit sin, in the presence of two witnesses.

THOMAS L. MCGREGOR. Vitnesses:

H. G. 'UNDERwooD, HENRY DANKERT. 

